Postemployment Benefits Weighted Average Assumptions Used for Benefit Costs (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Health and Welfare [Member]
Postemployment and Other Postretirement Benefit Plans [Line Items]
Discount rate	4.50%	3.50%
Postemployment Benefits [Member]
Postemployment and Other Postretirement Benefit Plans [Line Items]
Discount rate	8.25%	6.75%
Rate of compensation increase	4.50%	4.50%